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ferric chloride is readily available in ANY electronic supply store. it is used to make PRINTED CIRCUIT BOARDS (PCB) and a bottle can be bought for less then Php 30...

e. 1 to 2 second dip will do...then rinse the blade thorougly with water. the steel will turn dull in color. WIPE it dry and apply a light coating of oil. you will see the grain pattern from the forging

its not damascus but baka magustuhan mo

by the way, i use the water-ferric chloride solution to take away the glare from a shiny knife....it might give your bird an advantage expecially during nightime derbies....

well just in case you want to bring back the shine on your blade.
a quick dip in strong sodium hyrdroxide will do. as to where to find sodium hydroxide...just buy liquid SOSA from the grocery store...hehehe